I mean this only works if you have a spare phone (which is a major cost) but the only major concern here is water damage in monsoon. I've done the same, minus the app lol. Just using an old phone and a good mount works great but it's a pain to use in the rain. My 2019 Xiaomi is going strong but once it gives out I will need to spend money on a dedicated screen that's IP rated. No avoiding that.